Simplex Trading Portfolio holdings
Simplex Trading, founded in 2004 and headquartered in Chicago, Illinois, is a technology-driven proprietary trading firm specializing in market-making and liquidity provision, primarily in U.S. equity options and futures options. Leveraging advanced proprietary software and data-driven analysis, the firm optimizes trading strategies and develops innovative solutions to capitalize on financial market opportunities, maintaining a competitive edge through automation and a collaborative team of technologists and traders. With a workforce exceeding 300 and led by CEO Erik Swanson since 2014, Simplex operates with a low-ego, high-intelligence culture, focusing on minimal bureaucracy and rapid execution, while also making strategic venture capital investments in fintech startups. Recognized as a top workplace in Chicago by Built In’s 2025 awards, Simplex continues to evolve, blending cutting-edge technology with a commitment to market efficiency and growth.
Top Buys
| Rank | Stock | Value |
|---|---|---|
| 1 |
Apple
AAPL
|
+$34.5M |
| 2 |
Micron Technology
MU
|
+$33.9M |
| 3 |
Berkshire Hathaway Class B
BRK.B
|
+$30.8M |
| 4 |
NVIDIA
NVDA
|
+$23.5M |
| 5 |
State Street SPDR Dow Jones Industrial Average ETF Trust
DIA
|
+$22.2M |
Top Sells
| Rank | Stock | Value |
|---|---|---|
| 1 |
TWX
Time Warner Inc
TWX
|
+$34.8M |
| 2 |
Amazon
AMZN
|
+$31.2M |
| 3 |
Tesla
TSLA
|
+$17.6M |
| 4 |
Netflix
NFLX
|
+$15.5M |
| 5 |
Advanced Micro Devices
AMD
|
+$12.9M |
Sector Composition
| Rank | Sector | Weight |
|---|---|---|
| 1 | Technology | 1.23% |
| 2 | Consumer Discretionary | 0.92% |
| 3 | Communication Services | 0.73% |
| 4 | Financials | 0.62% |
| 5 | Industrials | 0.6% |
| Name | Market Value | Portfolio Weight | Shares or Principal |
Change in Stake | Capital Flow | |
|---|---|---|---|---|---|---|
1901
iShares Select Dividend ETF
DVY
$24B
| $891K | ﹤0.01% |
+9,123
| New | +$885K |
|
1902
Editas Medicine
EDIT
$399M
| $891K | ﹤0.01% |
24,882
-6,178
| -20% | -$219K |
|
1903
PUT
Polaris
PII
$4.15B
| $891K | ﹤0.01% |
73
-101
| -58% | -$11.8K |
|
1904
Neurocrine Biosciences
NBIX
$17.7B
| $890K | ﹤0.01% |
9,069
+8,869
| +4,435% | +$794K |
|
1905
ZTO Express
ZTO
$18.2B
| $890K | ﹤0.01% |
44,545
+34,225
| +332% | +$617K |
|
1906
PUT
Littelfuse
LFUS
$10.2B
| $889K | ﹤0.01% |
+39
| New | +$8.37K |
|
|
SKX
1907
CALL
DELISTED
Skechers
SKX
| $888K | ﹤0.01% |
296
+83
| +39% | +$2.65K |
|
|
DNB
1908
DELISTED
Dun & Bradstreet
DNB
| $888K | ﹤0.01% |
+7,244
| New | +$882K |
|
1909
PUT
Pacira BioSciences
PCRX
$1.02B
| $887K | ﹤0.01% |
277
-231
| -45% | -$7.97K |
|
|
CHL
1910
PUT
DELISTED
China Mobile Limited
CHL
| $887K | ﹤0.01% |
200
+61
| +44% | +$2.81K |
|
1911
CALL
Amdocs
DOX
$5.53B
| $886K | ﹤0.01% |
134
-201
| -60% | -$13.5K |
|
1912
PUT
HSBC
HSBC
$355B
| $886K | ﹤0.01% |
200
-844
| -81% | -$38.7K |
|
|
PRAH
1913
PUT
DELISTED
PRA Health Sciences, Inc.
PRAH
| $886K | ﹤0.01% |
+95
| New | +$8.18K |
|
|
MLNX
1914
PUT
DELISTED
Mellanox Technologies, Ltd.
MLNX
| $885K | ﹤0.01% |
105
-55
| -34% | -$4.5K |
|
1915
CALL
Snap-on
SNA
$20.9B
| $883K | ﹤0.01% |
55
-20
| -27% | -$3.03K |
|
1916
CALL
Xylem
XYL
$28.5B
| $882K | ﹤0.01% |
131
+30
| +30% | +$2.18K |
|
|
ACOR
1917
DELISTED
Acorda Therapeutics
ACOR
| $882K | ﹤0.01% |
256
+154
| +151% | +$472K |
|
1918
PUT
PBF Energy
PBF
$7.29B
| $880K | ﹤0.01% |
210
+92
| +78% | +$3.85K |
|
1919
CALL
Invesco DB Base Metals Fund
DBB
$306M
| $876K | ﹤0.01% |
488
-182
| -27% | -$3.41K |
|
1920
PUT
Essential Utilities
WTRG
$11.2B
| $875K | ﹤0.01% |
249
-1
| -0.4% | -$34 |
|
1921
CALL
Insmed
INSM
$23.2B
| $872K | ﹤0.01% |
+369
| New | +$9.5K |
|
|
HTZ
1922
CALL
DELISTED
Hertz Global Holdings, Inc.
HTZ
| $872K | ﹤0.01% |
655
-390
| -37% | -$6.32K |
|
1923
CALL
Carter's
CRI
$1.43B
| $867K | ﹤0.01% |
80
+48
| +150% | +$5.16K |
|
1924
PUT
Intellia Therapeutics
NTLA
$1.5B
| $867K | ﹤0.01% |
317
+71
| +29% | +$1.72K |
|
1925
PUT
CRH
CRH
$66.7B
| $866K | ﹤0.01% |
+245
| New | +$8.82K |
|
Similar funds
Simplex Trading's Q2 2018 Portfolio in Review
As of Q2 2018, Simplex Trading held 8,400 positions worth $25.5B, up 1,022% from $2.27B the previous quarter. Its ten largest holdings account for 29% of the portfolio.
Simplex Trading's Q2 2018 filing shows 2,282 new, 2,314 increased, 2,591 reduced and 1,035 closed positions. Its largest new stake was Alphabet (Google) Class C: 291,860 shares worth $16.3M. The largest sale was Time Warner Inc, an estimated $34.8M.
By sector, the portfolio is most concentrated in Technology at 1.2% of assets, down from 6.2% a quarter earlier, followed by Consumer Discretionary and Communication Services.
- Simplex Trading's largest Q2 2018 buy was Alphabet (Google) Class C: 291,860 shares worth $16.3M.
- Simplex Trading added most to Apple in Q2 2018, an estimated $34.5M increase.
- Simplex Trading's biggest Q2 2018 reduction was Amazon, cutting an estimated $31.2M.
- Simplex Trading fully exited Time Warner Inc in Q2 2018, selling an estimated $34.8M.
- Simplex Trading's ten largest holdings make up 29% of its $25.5B portfolio in Q2 2018.
- Simplex Trading opened 2,282 new positions and closed 1,035 in Q2 2018.
- Simplex Trading's portfolio value rose 1,022% quarter-over-quarter to $25.5B.
Based on Simplex Trading's 13F filing for Q2 2018, filed 30 Jul 2018.